Study On Some Hadronic Decays Of Double Heavy Baryons B_bc

The double heavy flavor baryon contains two heavy flavor quarks?the charm or bot-tom quark?and a light quark?the up,down or a strange quark?.The double heavy flavor baryon B_bchas a particularly important position in studying the three-body binding system of quarks,understanding the strong interactions based on the Quantum Chromo-dynamics?QCD?and the quark model.Therefore,the double heavy flavor baryon is an object that requires serious studies.The discovery and measurement of more double heavy flavor baryons could help us to understand the nature of matter structure and the strong interactions.In addition to?_cc⁺⁺what has been discovered,other double heavy flavor baryons need to be discovered,such as?⁺_cc,?⁺_cc,?⁺_bc,?⁰_bc,?⁰_bcand so on.Choosing the best detection process for each particle is the key to experimental search,and it is also an important goal of this theoretical research.In this thesis,we will calculate the branching fractions of the two-body non-leptonic weak decays of a spin-1/2 bottom charmed baryon(B_bc)to a spin 1/2 bottomed baryon and a light pseudo-scalar meson under the phenomenological scheme and find out the decay channel with larger decay branching fraction,and provide guidance for the search and discovery of experiments.The contribution of the decay process discussed in this thesis is divided into different topological diagrams,where the short distance contribution is calculated under the factor-ization hypothesis,and the long distance contribution is calculated based on the final-state interactions?FSIs?.The branching fractions of the decay channels considered in this the-sis are estimated numerically.The results indicate that?⁺_bc??_b⁰?⁺,?⁰_bc??_b^-?⁺and?⁰_bc??_b^?0?K⁰can be used as the candidate decays for searching the double heavy baryon?⁺_bc,?⁰_bcand?⁰_bc.We can also get some other meaningful information from the calculation results,which will help us understand the final-state interactions.